I just received my motor...I dont know a lot about it ...but I do have the cam card with it...its a comp cam part#12-408-8 grind# CS XR258HR-10


that seems to be small or what? guy told me that he had built the motor for someone that was thinking about adding a supercharger....thats why the cam was kept small..


should I keep it or replace it with a bigger cam? I dodnt ever plan o adding a SC....

 

See if you can exchange that cam for the comp cam 306 or get your money back and buy a GM 847 cam. Both are similar in duration, but the GM 847 cam has more lift. Needless to say I'm happy with my GM 847. Can you say 434 to the wheels. Also you need to thing about a good set of heads too, because if you don't have a good set of heads that cam will do you no good.

 

its already got a good set of heads...I guess...the intake base is an ACCEL....heres the item number 8054996753 to the motor on ebay...tell me what you think?....I couldnt pass it up...I know I need to change some stuff like the fuel lines and Im sure the oil pan..cause it was set up for a vette.


http://cgi.ebay.com/ebaymotors/ws/eB...tem=8054996753

 

Any set-up that has the stock style TPI intake will be very limited on high rpm HP, but the TQ will be crazy due to the long runners of the TPI design. It doesn't matter how many cubes or what cam you use you'll stop making HP around 5200rpm, the intake design can not support that much air above 5200rpm.

So, with that being said. Those E-Tech 165cc heads cannot and will not support a CC306 or GM 847 cam, you'll need at least 195CC heads. So the cam that is in the motor now will do okay for now. If I were you I'd run it as is and see if you're happy with it. I know you'll get better gas milage because gas is crazy . By the way the CC306 and GM 847 cam requires 10:1 CR anyways.

Don't get me wrong if your looking for alot TQ then stay with what you have or get a Super Ram or maybe a Stealth Ram. Remember a good combonation is the key to good horse power ( Heads and Cam choice).

 

so what do you suggest I do? I only want to do this once...and since the motor is out of the car I can work on it alot easier. the whole upper portion is suppose to be ported..wont that help with the upper RPM's?
From talking with the guy, he told me that the motor has 10:1 already but he may be wrong...the heads I have are the EDL-6089's they are a little bigger than the e-tech 165's

I already have the intake base...what I went with something different on top...I want to have over 400 on both the TQ and HP....what do I do?


thanks!

 

You can port that intake until your turn blue in the face, 5200rpm is about the best you'll get out the design. When GM designed that intake it was first going to be a truck motor in '85, but it ended up in the vette. I've seen some make power as high as 5500rpm too, so it can be done it all depence on your set up.

Those heads are still to small 190cc or higher will support your cam choice. I know I said 195cc earlier, but 190cc will due just fine. If you are going to stay with the stock style intake set up, then I suggest a CC305 or LT4 hot cam. The reason why I say those two cams is because of the intake restriction of 5200rpm. The CC306 and GM 847 cams makes peak hp at 6100 to 6500 rpm and those cams start making power at 3500 rpm and you'll need a mini ram, stealth ram, or single plane EFI intake to support it. The hot cam and CC305 starts at 2500rpm, right were you need it with the stock style intake design. Hey good luck.

 

Ok....heres what I got planned...Im going to sell the whole TPI setup from the motor I bought and from my motor to fund me a miniram setup for my 383.....or is that a little extreme?...would that be overkill? I want to have a bunch or torque for the street racin around here but have the top end for when I go to the track....can I have both?
but then will my head and cam become the bottle neck?